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Sometimes change in varscrollable window's size can result in unused empty space after the last item. Fix it by decrementing first visible item position as long there is available space (fixes #11758).

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63570 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Jaakko Salli 2010-02-28 10:16:49 +00:00
parent 78a1707501
commit 0fa9b2ed61
1 changed files with 33 additions and 0 deletions
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33
src/generic/vscroll.cpp
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@ -674,6 +674,39 @@ bool wxVarScrollHelperBase::DoScrollPages(int pages)
void wxVarScrollHelperBase::HandleOnSize(wxSizeEvent& event)
{
if ( m_unitMax )
{
// sometimes change in varscrollable window's size can result in
// unused empty space after the last item. Fix it by decrementing
// first visible item position according to the available space.
// determine free space
const wxCoord sWindow = GetOrientationTargetSize();
wxCoord s = 0;
size_t unit;
for ( unit = m_unitFirst; unit < m_unitMax; ++unit )
{
if ( s > sWindow )
break;
s += OnGetUnitSize(unit);
}
wxCoord freeSpace = sWindow - s;
// decrement first visible item index as long as there is free space
size_t idealUnitFirst;
for ( idealUnitFirst = m_unitFirst;
idealUnitFirst > 0;
idealUnitFirst-- )
{
wxCoord us = OnGetUnitSize(idealUnitFirst-1);
if ( freeSpace < us )
break;
freeSpace -= us;
}
m_unitFirst = idealUnitFirst;
}
UpdateScrollbar();
event.Skip();